Fix a few Minor Issues in ccFormat Script
Fix a few Minor Issues in ccFormat Script

This change makes the following changes:

1) Change the regular expression in the --header-filter passed to clang-tidy
   to include just the name LLILC, and not the entire path to LLILC.
   Using the entire path suppressed many warnings.
2) System-headers were not included in the clang-tidy invocation, fixed this.
3) Remove llvm-header-guard and llvm-include-order from the set of clang-tidy
   checks until issues Microsoft\clang-tidy-extra: #2 and #3 are fixed.

manu-silicon/llilc,manu-silicon/llilc,BruceForstall/llilc,pgavlin/llilc,swaroop-sridhar/llilc,russellhadley/llilc-original,marksantos/llilc,JosephTremoulet/llilc,kyulee1/llilcjit,mmitche/llilc,libengu/llilc,mmitche/llilc,russellhadley/llilc-original,swaroop-sridhar/llilc,JosephTremoulet/llilc,russellhadley/llilc-original,erozenfeld/llilc,richardlford/llilc,BruceForstall/llilc,mmitche/llilc,tempbottle/llilc,kyulee1/llilcjit,manu-silicon/llilc,swaroop-sridhar/llilc,tempbottle/llilc,libengu/llilc,adiaaida/llilc,BruceForstall/llilc,erozenfeld/llilc,pgavlin/llilc,dkorolev/llilc,marksantos/llilc,libengu/llilc,AndyAyersMS/llilc,richardlford/llilc,kyulee1/llilcjit,AndyAyersMS/llilc,russellhadley/llilc,adiaaida/llilc,erozenfeld/llilc,dotnet/llilc,russellhadley/llilc,dotnet/llilc,JosephTremoulet/llilc,marksantos/llilc,mmitche/llilc,russellhadley/llilc-original,adiaaida/llilc,libengu/llilc,dotnet/llilc,AndyAyersMS/llilc,pgavlin/llilc,dkorolev/llilc,tempbottle/llilc,erozenfeld/llilc,russellhadley/llilc,dkorolev/llilc,richardlford/llilc